panchalhimself

Storage overview in kubernetes

24 June 2023

Container Storage

The default container file system is shortlived.

The contents will exist as long as the container exists.

Volumes

For persistant data.

Store data outside the container file system.

Persistent Volume

Store the persistent data as an abstract resource and consumed by the pods.

Container > Persistent Volume Claim > Persistent Volume > External Storage

You need a PVC associated with the container to use the volume.

Volume Types

Volume types determine handling of the storage.

NFS

Cloud

ConfigMaps and Secrets

Directory on the K8s node.

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Using K8s Volumes

Volumes and volumeMounts

So we need a volumes under the spec as well as a volumeMounts unde the container block for the deined container.

example.yaml

apiVersion: v1
kind: Pod
metadata:
  name: test-pd
spec:
  containers:
  - image: registry.k8s.io/test-webserver
    name: test-container
    volumeMounts:
    - mountPath: /test-pd
      name: test-volume
  volumes:
  - name: test-volume
    hostPath:
      path: /data

Sharing Volumes between Containers.

needs to be tested…..

shared-example.yaml

apiVersion: v1
kind: Pod
metadata:
  name: test-pd
spec:
  containers:
  - image: registry.k8s.io/test-webserver
    name: test-container-input
    volumeMounts:
    - mountPath: /input
      name: test-volume
  - image: registry.k8s.io/test-webserver
    name: test-container-output
    volumeMounts:
    - mountPath: /output
      name: test-volume
  volumes:
  - name: test-volume
    hostPath:
      path: /data

Common Volume Types

hostPath

emptyDir

hostPath

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Persistent Volumes

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